Protaspis gemmifera Larsen and Patterson 1990

• Main Author: Patterson, Won Je Lee David J.
• Format: Text
• Language: unknown
• Published: Zenodo 2000
• Subjects: Biodiversity; Taxonomy; Chromista; Cercozoa; Imbricatea; Thaumatomonadida; Thaumatomastigidae; Protaspis; Protaspis gemmifera; Botany Bay; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.5281828; https://zenodo.org/record/5281828

Protaspis gemmifera Larsen and Patterson, 1990 (®gures 22i, 23f±h) Description. Cell outline oval or roundish, 9±16 Mm long and 9±11 Mm wide, dorso-ventrally ¯attened. Cell surface is rather warty. Two ¯agella insert subapically in an indistinct ventral furrow. The anterior ¯agellum is as long as the cell and the posterior ¯agellum is about 1.3±3 times the cell length. The posterior ¯agellum inserts in an antero-posterio r line of the anterior ¯agellum and trails behind the cell. The nucleus is situated anteriorly below the ¯agellar insertion, has caps and is roundish. Reserve material may be present as oval or rod shaped bodies. Glides very fast with the anterior ¯agellum. Produces pseudopodia from the ventral furrow. Sometimes commonly observed. Description based on observations of 33 cells. Remarks. Generally, our observations agree with the original description of Larsen and Patterson (1990) although they did not refer to the warty surface. Protaspis gemmifera was recorded from Brazil and North Atlantic by Larsen and Patterson (1990) and Patterson et al . (1993), respectively. Cell lengths were previously reported as 10±17 Mm (Larsen and Patterson, 1990; Patterson et al ., 1993). Nuclear caps were not seen in any of the cells described by Patterson et al . (1993) but this character may have been overlooked because the nuclear caps may be di cult to see in fast moving cells. Some cells did not have reserve materials in the posterior end of the cell, and reserve materials may not be useful as a diagnostic character although we have not seen the distinctive rod-shaped reserve materials in any species other than this one. Protaspis gemmifera resembles P. verrucosa Larsen and Patterson, 1990 in general appearance and length, but it has been distinguished by the longitudinal ventral furrow in P. verrucosa and the presence of nuclear caps in P. gemmifera . Figure 60b in Larsen and Patterson (1990), which is the type micrograph for P. verrucosa , shows some similarity to our cells in ®gure 23h. We are not sure whether these two species are clearly distinguishable. Protaspis gemmifera is probably detritivorous (Patterson et al ., 1993). The organism referred to as P. simplex by Tong et al . (1998) has probably been illustrated by pictures of P. gemmifera , but having consulted original records, we can con®rm that both species were present. The genus contains nine species: P. gemmifera Larsen and Patterson, 1990, P. glans Skuja, 1939, P. major Skuja, 1939, P. metarhiza Skuja, 1939, P. obovata Skuja, 1948, P. obliqua Larsen and Patterson, 1990, P. simplex Vùrs, 1992, P. tegere Larsen and Patterson, 1990 and P. verrucosa Larsen and Patterson, 1990. The boundaries among many species are not clear (table 2), and this genus needs more attention. : Published as part of Patterson, Won Je Lee David J., 2000, Heterotrophic ¯ agellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on page 544 : {"references": ["LARSEN, J. and PATTERSON, D. J., 1990, Some \u00af agellates (Protista) from tropical marine sediments, Journal of Natural History, 24, 801 \u00b1 937.", "PATTERSON, D. J., NYGAARD, K., STEINBERG, G. and TURLEY, C., 1993, Heterotrophic \u00af agellates and other protists associated with oceanic detritus throughout the water column in the mid North Atlantic, Journal of the Marine Biological Association of the United Kingdom, 73, 67 \u00b1 95.", "TONG, S. M., NYGAARD, K., BERNARD, C., VORS, N. and PATTERSON, D. J., 1998, Heterotrophic \u00af agellates from the water column in Port Jackson, Sydney, Australia, European Journal of Protistology, 34, 162 \u00b1 194.", "SKUJA, H., 1939, Beitrag zur Algenora Lettlands II, Acta Horti botanici Universitatis latviensis, 11 \u00b1 12, 41 \u00b1 169.", "SKUJA, H., 1948, Taxonomie des Phytoplanktons einiger Seen in Uppland, Schweden, Symbolae Botanicae Upsalienses, 9, 5 \u00b1 399."]}